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Leases (Maturities of Lease Liabilities) (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Lease Liability Maturity Term [Line Items]    
2019 $ 22  
2020 32  
2021 8  
2022 1  
2023 1  
Thereafter $ 1  
ASC 840    
Lease Liability Maturity Term [Line Items]    
2019   $ 61
2020   48
2021   18
2022   9
2023   8
Thereafter   $ 33